American Express chargeback reason codes

How American Express disputes work

American Express often acts as both the card network and the card issuer, so the dispute team you deal with is usually Amex itself rather than a separate bank. Verdikx is a fraud, chargeback and dispute platform for e-commerce and SaaS merchants, and this guide explains the Amex codes you will see in your processor dashboard or Amex merchant account.

According to the Amex US disputes reference guide, a Card Member dispute follows one of two paths:

1. Inquiry first. If Amex cannot resolve the dispute with the information it has, it sends you an Inquiry (a three-digit inquiry code such as 155 "Not Received, Credit Requested" or 176 "No Knowledge, Card Not Present") and asks for documents. A sufficient, on-time reply closes the case with no chargeback.
2. Upfront chargeback. If Amex decides it already has enough information, it may debit your account straight away with a chargeback code (C08, F29 and so on). You can still reverse it with the right documents inside the deadline.

If you ignore an inquiry or answer it incompletely, the result is a chargeback under R13 (No Reply) or R03 (Insufficient Reply), and those are very hard to undo. Stripe's documentation notes that American Express and Discover are the networks that most often use an inquiry phase, and that unanswered inquiries can escalate to unwinnable chargebacks.

Time limits

• Card Member filing window: up to 120 days from the transaction date in most cases, per the Amex guide. Not-received, returned or canceled goods and redisputes can have different windows.
• Merchant response: Amex states you have 20 days to respond to an Inquiry or a Chargeback.
• Redisputes: Card Members are limited to 2 disputes per charge in most cases.
• Processor deadlines are shorter. If you accept Amex through a processor such as Stripe or Shopify Payments, the processor relays the case and sets its own evidence due date (Stripe cites 7 to 21 days depending on the network). The date on your case is the one that counts.

The code families

• Authorization (A01, A02, A08): the charge did not carry a valid, current approval for the amount submitted.
• Card Member Disputes (C02 to C32): credits, returns, cancellations, non-receipt, recurring billing, not-as-described and damaged goods.
• Fraud (F10, F14, F24, F29, F30, F31): the Card Member denies participating. F29 (card not present) is the one online stores see most.
• Fraud programs (FR2, FR4, FR6): your merchant account is enrolled in a chargeback program, so the only defense is that you were not enrolled or already refunded.
• Inquiry/Miscellaneous (R03, R13, M01): outcomes of how you handled the inquiry.
• Processing Errors (P01 to P23): wrong card number, amount, currency, timing or debit/credit direction.

Compelling evidence on Amex

Amex accepts compelling evidence for some codes, mainly C08 and F29: proof that links the person who received the goods to the Card Member, a shipping address that matches an earlier undisputed order, or for digital goods and recurring billing, prior undisputed transactions with matching account, device, IP or email details. Merchants in the Fraud Full Recourse program are not eligible to use compelling evidence for fraud claims.

How Verdikx helps with Amex disputes

• Amex disputes from Shopify Payments and Stripe are imported automatically; Braintree, Adyen and Checkout.com connections are in beta, and any processor's notice can be forwarded by email or CSV.
• Each case opens with a reason-code playbook and evidence checklist for its Amex code, and an AI draft that you review before anything is submitted.
• Delivery proof, customer conversations from helpdesks (beta), subscription records from Recharge, Skio, Bold, Recurly and Chargebee (beta) and Loop returns (beta) are pulled into the packet.

Verdikx does not decide outcomes: American Express does. See chargeback management and representment.